1990 SP 587 270500054 BN-38 (RB) MAIN-100 PILOT-N/A ? 11.5 - 12.5psi LOW- 1-3/4 HIGH- N/A
1995 SP 587 270500203 BN-38 (SB) MAIN-142.5 PILOT-65 2.0n/s 21 - 37psi LOW- 1-1/4 HIGH- 0
They have the same mounting base, but are different carbs. Ones round body, other square body.
